In mixology, what is Crème de Noyaux?

Crème de Noyaux is an almond-flavored crème liqueur, although it is actually made from apricot kernels or the kernels of peach or cherry pits, which provide an almond-like flavor. Both Bols and Hiram Walker produce artificially colored red versions of the liqueur.

Historically, crème de noyaux would contain trace amounts of hydrogen cyanide, which is poisonous. Although the chemical was not normally present in a dangerous intensity, bottles of 19th-century Noyaux left for decades in the cellar would sometimes have all the cyanide float up to the top, with lethal results for the drinker of the first glass.

Author Dorothy Sayers used this peculiarity of the old Crème de Noyaux in her short story "Bitter Almonds" (collected in In the 'Teeth of the Evidence', 1939).

The name comes from the French 'noyau': "kernel, pit, or core". It is an ingredient in the Fairbank cocktail, the Pink Squirrel cocktail and in a cocktail called Old Etonian.

In 2013, Tempus Fugit Spirits recreated a 19th-century-style Crème de Noyaux, distilling both apricot and cherry pits, amongst other botanicals, and coloring the liqueur with red cochineal, as was done in the past. Care was taken to remove the trace elements of hydrogen cyanide produced in the process.